Question

Which type of interactions is responsible for making the $\alpha -$helix structure stable?

• A. Peptide bonds between $- NH_{2}$and –CO groups of adjacent carbon chains.
• B. Hydrogen bonds between – NH of amino acid in one turn with – CO of amino acid to adjacent turn.
• C. – OH group of one amino acid with – CO group of other amino acid on the turn.
• D. Hydrogen bonds between adjacent amino acids.

Answer 1

Answer: (B)

Hydrogen bonds between – NH of amino acid in one turn with – CO of amino acid to adjacent turn.

Answer 2

In $\alpha -$helix, a polypeptide chain is stabilized by the formations of hydrogen bond between – NH – group of amino acids in one turn with Fig. group of amino acids belonging to adjacent then.